Sample records for suvanee supavej chev

  1. Le fonds Gabriel Tarde au CHEVS


    Louise Salmon


    Le fonds d’archives « Gabriel Tarde » déposé au CHEVS nous permet de mieux saisir l’érudit autodidacte que fut Gabriel Tarde. De la genèse de sa pensée à ses réseaux de sociabilité, de l’homme de sciences à l’homme de lettres, ses archives témoignent à la fois des usages et des enjeux des ressources archivistiques en histoire, mais elles permettent surtout un renouvellement du regard sur Gabriel Tarde en l’inscrivant au cœur de son temps que fut la fin du XIXème siècle.At the CHEVS in Paris, ...

  2. Contrasting genetic diversity among Oryza longistaminata (A. Chev ...

    African Journals Online (AJOL)

    Contrasting genetic diversity among Oryza longistaminata (A. Chev et Roehr) populations from different geographic origins using AFLP. ... The mean Nei's genetic diversity for all the 176 loci in the 48 populations was 0.302 and diversity for populations within countries ranged from 0.1161 to 0.2126. Partitioning of between ...

  3. Genotypic performance, character correlations and path analysis of pod yield in Abelmoschus caillei (A. Chev. Stevels

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    Christopher O. Alake


    Full Text Available Direct selection based on pod yield is often a problem in West African okra (Abelmoschus caillei (A. Chev. Stevels breeding programs. Information on inter-relationships among traits to implement indirect selection for pod yield is needed. Objectives of this study were to evaluate the performance of West African okra varieties in two cropping seasons prevailing in Nigeria, and to determine the associations among main agronomic characters and their influence on pod yield. Twenty-five genotypes were grown in two planting seasons at the Research Farm of the Federal University of Agriculture, Abeokuta in 2008-2009 using a randomized complete-block design with three replications. Sixteen plant characters were measured. The data were subjected to variance, correlation and path analyses. Four genotypes, viz., CEN 010, CEN 012, NGAE-96-04 and AGA 97/066-5780 demonstrated potential for high pod yield. CEN 012 and AGA 97/066-5780 in addition, demonstrated early flowering higher number of pods. Character associations varied between planting seasons. The dependence of pod yield on final plant height, number of branches per plant, number of pods per branch, number of pods per plant, number of ridges per pod, weight of 250 seeds, pod length and seed weight per plant was noted in both planting seasons. In both seasons, number of pods per plant exhibited a high positive direct effect on pod yield. In conclusion, the trait of most interest for improving pod yield under early and late-season conditions was number of pods per plant.

  4. A generalized nonlinear tempeature response function for some growth and developmental parameters in kiwifruit (Actinidia deliciosa (A. Chev. C. F. Liang & A. R. Ferguson Função não linear de resposta à temperatura para alguns parâmetros de crescimento e desenvolvimento em kiwi (Actinidia deliciosa (A. Chev. C. F. Liang & A. R. Ferguson

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    Nereu Augusto Streck


    Full Text Available Temperature is a major factor that affects metabolic processes in living organisms. Thermal time has been widely used to account for the effects of temperature on crop growth and development. However, the thermal time approach has been criticized because it assumes a linear relationship between the rate of crop growth or development and temperature. The response of the rate of crop growth and development to temperature is nonlinear. The objective of this study was to develop a generalized nonlinear temperature response function for some growth and developmental parameters in kiwifruit (Actinidia deliciosa (A. Chev. C. F. Liang & A. R. Ferguson. The nonlinear function has three coefficients (the cardinal temperatures, which were 0ºC, 25ºC, and 40ºC. Data of temperature response of relative growth rate, relative leaf area growth, net photosynthesis rate, and leaf appearance rate in kiwifruit (female cv. Hayward at two light levels, which are from published research, were used as independent data for evaluating the performance of the nonlinear and the thermal time functions. The results showed that the generalized nonlinear response function is better than the thermal time approach, and the temperature response of several growth and developmental parameters in kiwifruit can be described with the same response function.Temperatura é um dos principais fatores que afeta a velocidade das reações metabólicas em seres vivos. O método da soma térmica tem sido o mais usado para descrever o efeito da temperatura sobre o crescimento e desenvolvimento vegetal, mas este método tem recebido críticas, pois nele é assumido uma relação linear entre crescimento ou desenvolvimento vegetal e temperatura. A resposta do crescimento e desenvolvimento vegetal à temperatura é não linear. O objetivo deste trabalho foi desenvolver uma função geral não linear de resposta à temperatura para alguns parâmetros de crescimento e desenvolvimento em kiwi

  5. The chromosome number of Anthocleista djalonensis Chev

    NARCIS (Netherlands)

    Gadella, T.W.J.


    Few cytological data are available of the Loganiaceae. Its subfamily Buddleioideae, often considered a separate family, is a well-defined group, as far as could be concluded from the chromosome number. On the other hand, nothing can be said with certainty of the other subfamily, the Loganioideae,

  6. Terminalia Ivorensis A.Chev and Nauclea Diderrichii De Wild

    African Journals Online (AJOL)

    Nekky Umera

    Agriculture, University of Port Harcourt, PMB 5323, Port Harcourt, Rivers. State. Nigeria. Okereke, V. C. - Department of Crop and Soil Science, Faculty of. Agriculture, University of ..... and Ponderosa pine seeds in Argentina. Seed science and technology. 30:559-566. Maramorosch, K., Shikata, E and Shiyan, L. 1982: Little ...


    African Journals Online (AJOL)


    Department of Botany, Obafemi Awolowo University, Ile-Ife, Nigeria. ** Natural History Museum, Obafemi Awolowo University, Ile-Ife, Nigeria. *** Department of Botany, Obafemi Awolowo University, Ile-Ife, Nigeria. Corresponding Author: Abolade O. Bolaji, Department of Botany, Obafemi Awolowo University, Ile-Ife, Nigeria.


    African Journals Online (AJOL)


    By the year 2000, the population of had declined and, by the year 2010, the population of had given way to as a result of massive rice farming. The intermediate plant forms that lined the bank of the largest impoundment had also disappeared. RESULTS AND OBSERVATIONS. Bolaji et al.: The Occurence of a Hybrid Swarm.

  9. In vitro viability and preservation of pollen grain of kiwi (Actinidia chinensis var. deliciosa (A. Chev. A. Chev

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    Douglas André Steinmacher


    Full Text Available Kiwi is a dioecious plant species, requiring cross pollination for fruit production. The objective of this study was toevaluate the in vitro viability and shelf life of pollen grains of two kiwi varieties. Flowers of the cultivars Matua and Tomuri werecollected and the pollen germinated in vitro, in culture medium containing agar (1 %, sucrose (0, 5, 10, 20 and 40 % and boric acid(0 and 50 mg L-1H3BO3. Pollen grains were stored in a BOD incubator (25.0 °C, refrigerator (4.0 °C, freezer (-18.0 °C and in liquid N2 (-196.0 °C, and evaluated after 0, 40, 120, 240 and 365 days. The culture medium enriched with 12 % sucrose and 50 mgL-1 H3BO3 was the most suitable. Pollen grains can be stored for a short period in the refrigerator or freezer, and cryopreserved for at least one year.

  10. Variação estrutural quantitativa no lenho de Terminalia ivorensis A. Chev., Combretaceae

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    Urbinati Cláudia V.


    Full Text Available Com o objetivo de analisar a variação anatômica ao longo do caule de Terminalia ivorensis, estudaram-se amostras de madeira de três indivíduos, nos planos radial e axial. Para tal, corpos de prova foram obtidos a partir de discos de madeira, de 2 em 2cm, no sentido medula-câmbio. A metodologia usada para desenvolver o trabalho foi aquela tradicionalmente recomendada para estudos em anatomia vegetal. A descrição anatômica realizada seguiu as recomendações do IAWA Committee. No sentido radial do caule, alguns elementos anatômicos apresentaram tendências de variação definidas e significativas estatisticamente quando aplicado o teste Tukey para comparação de médias. São eles: freqüência, diâmetro e comprimento dos elementos de vaso, freqüência de raios/mm linear, comprimento dos raios em número de células, e comprimento e espessura da parede das fibras. Já no sentido axial, todas as variáveis analisadas não se mostraram estatisticamente significativas. Os resultados observados devemse, principalmente, à caracterização bem definida dos lenhos juvenil e adulto na madeira de Terminalia ivorensis.

  11. Antibacterial activity of the stem bark of Tieghemella Heckelii Pierre ex. A Chev against methicillin-resistant Staphylococcus aureus. (United States)

    Kipre, B G; Guessennd, N K; Koné, M W; Gbonon, V; Coulibaly, J K; Dosso, M


    Tieghemella heckelii (Sapotaceae) is a medicinal plant used in Africa, particularly in Côte d'Ivoire for treating various diseases including infections. Identification of prospective antibacterial compounds from stem bark of this plant as a result of its medicinal virtue, led to screening activity against methicillin resistant bacteria. Six extracts (hexane, chloroform, ethyl acetate, ethanol, methanol and sterile distilled water) were prepared and tested on methicillin resistant Staphylococcus aureus (MRSA) using broth microdilution method for activity assessment. From this experiment, the minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) of the plant extracts were determined in sterile 96-well microplates in order to search for both bacteriostatic and bactericidal effects. Afterwards, data analysis was performed using GraphPad Prism5 software (One-way ANOVA and Turkey Multiple Comparison test). The results were then presented as Mean ± SD for experiment repeated three times. Four extracts (ethyl acetate, methanol, ethanol and sterile distilled water) showed credible potency, with strong, significant, and moderate growth inhibition of the MRSA tested. The MIC values which varied from 45 μg/mL to 97 μg/mL according to microbial phenotype, resolutely established the activity of the plant extracts. Additionally, the MBC values which varied, depending on the type of bacteria strain, revealed the bacteriostatic and bactericidal effects of the active extracts against Methicillin-resistant Staphylococcus aureus. The present study is a confirmation of the therapeutic potential of Tieghemella heckelii and its promising contribution to the discovery of a novel antibacterial drug pertaining to these resistant strains.

  12. In vitro anti-plasmodial activity of three herbal remedies for malaria in Ghana: Adenia cissampeloides (Planch.) Harms., Termina liaivorensis A. Chev, and Elaeis guineensis Jacq. (United States)

    Annan, Kofi; Sarpong, K; Asare, C; Dickson, R; Amponsah, Ki; Gyan, B; Ofori, M; Gbedema, Sy


    Herbal remedies of Adenia cissampeloides, Terminalia ivorensis, and Elaeis guineensis among others have been used in Ghana for the treatment of various ailments including malaria. However, most of these remedies have not been scientifically investigated. This study, therefore, seeks to investigate the anti-plasmodial activity of these plants. The ethanolic extracts of A. cissampeloides stem, T. ivorensis stem bark, and E. guineensis leaves were tested for in vitro anti-plasmodial activity against chloroquine-resistant strains of Plasmodium falciparum. Thin blood films were used to assess the level of parasitemia and growth inhibition of the extracts. The IC (50) of A. cissampeloides, T. ivorensis, and E. guineensis were 8.521, 6.949, and 1.195 μg/ml, respectively, compared to artesunate with IC(50) of 0.031 μg/ml. The result of this study appears to confirm the folkloric anti-malarial use these plants.


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    Full Text Available O kiwi é uma frutífera exótica de clima temperado cuja principal característica de seus frutos é o alto teor de vitamina C. A propagação por semente é de importância, pois além de produzir plantas que se destinem à porta-enxertos, contribui para a obtenção de novas cultivares. Pesquisas tem demonstrado um baixo índice de germinação das sementes de kiwi. O objetivo deste trabalho foi o de avaliar dois diferentes métodos de elevação do índice de germinação de sementes de kiwi, da cultivar Bruno: estratificação à baixa temperatura (4 0C, através dos tratamentos de zero, duas e quatro semanas; ácido giberélico (AG3 testado em cinco diferentes concentrações (0, 100, 500, 1.000 e 2.500 ppm. A testemunha, para ambos os métodos, apresentou um baixo percentual de germinação das sementes (2,49%. Sementes não submetidas aos tratamentos de estratificação, mostraram uma resposta significativa aos tratamentos com AG3, até a concentração de 500 ppm, após a qual se mantiveram constantes. O índice máximo de germinação de sementes não estratificadas, foi de 36,85% com 2.500 ppm de AG3. A estratificação (40C, através de seus tratamentos de duas e quatro semanas, apresentou um efeito significativo na germinação das sementes (70,23%, não ocorrendo diferença significativa entre estes. Conclui-se que o melhor método de ampliação do índice de germinação de sementes de kiwi da cultivar Bruno, foi a estratificação à baixa temperatura (40C, com tratamentos de duas ou quatro semanas de estratificação.The kiwifruit is an exotic fruit tree of temperate climate whose main characteristic is the high content of vitamin C. Seed propagation of this species is very important to produce new varieties and rootstocks. Research results have demonstrated that this species shows a low porcentage of seed germination. The objective of this study was to evaluate different procedures to overcome seed dormancy: stratification (4°C for 2 and 4 weeks; (gibberelic acid GA3 with 0, 100, 500, 1,000 and 2,500 ppm. The seed germination of the check was 2,49%. Seeds not submitted to the stratification treatment showed a significative response to GA3 doses until 500 ppm. Seeds submitted to the stratification treatment (2 and 4 weeks did not show response to GA3. The highest level of germination was 36.85% at the level of 2,500 ppm. There was a significant effect of stratification on seed germination (70,23%, however not between the two treatments. Seeds stratified for 2 weeks showed a significantly higher germination than the seeds submitted to the 500 ppm GA3 treatment. In conclusion, stratification for two weeks was the best procedure to overcome satisfactorly kiwi seed dormancy, cv. Bruno.

  14. Studies on heterosis in Abelmoschus esculentus (L.) Moench and A. callei (A. Chev) stevels cultivars during shorter day photoperiods in south eastern Nigeria. (United States)

    Udengwu, Obi Sergius


    Better parent heterosis was studied in direct and reciprocal crosses using 9 early and late okra cultivars which belonged to the Early-early, Early-late, Late-early and Late-late okra flowering types. The ANOVA for length of pod, circumference of pod, number of locules per pod, number of seeds per pod, Number of pods per plant, weight of 1000 seeds, density of seeds, weight of pods per plant, days to flower opening, plant height and circumference of stem at 10 cm above soil level, showed almost very highly significant differences-an indication that the cultivars are genetically diverse. Very highly significant, narrow and intermediate, heterosis was recorded for most of the direct and reciprocal crosses, showing that selections could be made from the hybrids to meet desired local okra qualities. A cross between an Early-late and Late-early parents, using early okra as the maternal parent, gave rise to a stable viable bridge hybrid which outperformed the better parent in many respects thereby overcoming the hitherto strong barrier to gene flow in interspecific hybridization studies involving the two okra types and also indicating the existence of maternal effects. Consequently with this development, the window has been opened for possible accelerated transfer of several desirable genes from late okra types to many promising but vulnerable early okra types. This could result to minimizing the further erosion of such early okra germplasm still in the custody of the local farmers.

  15. Domestication paysanne des arbres fruitiers forestiers : cas de Coula edulis Bail, Olacaceae, et de Tieghemella heckelii Pierre ex A. Chev., Sapotaceae, autour du Parc National de Taï, Côte d'Ivoire

    NARCIS (Netherlands)

    Bonnéhin, L.


    In Côte d'Ivoire agriculture has confined the forest to national parks and state forests. Forest species are disappearing from the rural landscape and the products of these species get ever rarer. Thus, the rural population goes out collecting these products in national parks and state

  16. The South African Species of Myrica

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    D. J. B. Killick


    Full Text Available The South African species of Myrica are revised, the 19 species previously recognized being reduced to 9. One variety is elevated to specific rank, viz. M. conifera Burm.f. var.  Integra A. Chev. becomes M. Integra (A. Chev. Killick.

  17. Phytochemical and antibacterial properties of Parkia biglobosa and ...

    African Journals Online (AJOL)

    Jacq) Benth and Parkia bicolor A. Chev (Mimosaceae) with respect to their photochemical and antimicrobial properties was carried out. Preliminary phytochemical screening showed that both plants had similar constituents namely cardiac ...

  18. Insects of the Sacarabaeidae family associated with guava (Psidium guajava L. in Ceballos, Ciego de Ávila, Cuba

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    Ioan Alberto Rodríguez Sanatana


    Full Text Available Was performed a diagnosis to identify the species of the Scarabaeidae family present in guava cultivation, to determine the distribution and ecological indices of abundance and relative frequency of species associated with the cultivation. The sampling was carried out by light traps, in 35 fields of guava, in five Basic Units of Production and a small property, all belonging to the Ceballos Agroindustrial Enterprise, between May 2013 and June 2015. It was determined that the species of the Scarabaeidae family associated with the cultivation, were Cyclocephala cubana Chap., Phyllophaga patruelis Chev., Phyllophaga puberula Duval, Phyllophaga pilositarsis Blackwelder, Anomala calceata Chev., Strategus sarpedon Burm., Digitonthophagus gazella Fabricius and Dyscinetus picipes Burm. The most abundant species were C. cubana 60% (very abundant and A. calceata Chev. with 10 % (abundant. The species C. cubana, P. patruelis, P. puberula, P. pilositarsis, A. calceata and S. sarpedon, were very frequent, while D. gazella and D. picipes were frequent in guava cultivation.

  19. Browse Title Index

    African Journals Online (AJOL)

    Items 51 - 100 of 155 ... ... Incidence of Gummosis and Its Effect on Growth Attributes of Terminalia ivorensis A. Chev. and Taminalia mantaly H. Perrier in Port Harcourt, Nigeria, Abstract PDF. GE Omokhua, UD Chima. Vol 2, No 1 (2013), Inductivism and Science: An Appraisal of Scientific Methodology, Abstract PDF. C C Obi.

  20. Phytochemical and antimicrobial studies of gynandropsis gynandra ...

    African Journals Online (AJOL)

    Extracts of leaves and stems of Gynandropsis gynandra L. (Briq.) and Buchholzia coriaceae Engl. (A. Chev.) were screened phytochemically for the presence of secondary metabolites and for in vitro antibacterial and antifungal properties respectively. The main secondary metabolites indicated in both plants were alkaloids, ...

  1. Separation and characterization of phenolic compounds from ...

    African Journals Online (AJOL)

    Terminalia ivoriensis A. Chev. (Combretaceae) is an Ivorian medicinal plant. There is little ethnobotanical and almost no chemical information available for this species. The aim of this study was to isolate phenolic compounds from T. ivoriensis. In this way, its ethyl acetate extract (Ea) was fractionated by silica gel column ...

  2. Effet de l'extrait aqueux de l'écorce de tige de Anthocleista ...

    African Journals Online (AJOL)

    ... the aqueous extract of Anthocleista djalonensis A. Chev (Gentianaceae) stem bark on the glycaemia of rabbits. English Abstract. In Côte d'Ivoire, diabetes mellitus is a major public health problem with an estimated prevalence of 9.6%. Herbal remedies constitute a therapeutic alternative for the treatment of this pathology.

  3. Assessment of Growth Performance of Two Cultivated Okra Species ...

    African Journals Online (AJOL)

    Six accessions of cultivated Okra (Abelmoschuscaillei (A. Chev.) Stevels) and Abelmoschusesculentus (L.) Moench) were evaluated using growth parameters in crude oil contaminated soil. Seeds were collected from collected from Nigerian Institute of Horticulture (NIHORT), Ibadan and from home gardens in Benin City.

  4. Effects of Mycorrhiza on the Growth and Productivity of Faidherbia ...

    African Journals Online (AJOL)

    The effects of mycorrhiza on growth and growth components of Faidherbia albida (Del.) A. Chev. was investigated in the semi arid environment of Sokoto State, Nigeria. A complete randomized block design with five replications and factorial combination of three watering regimes (daily for unstressed plant, twice weekly for ...

  5. Influence de la décomposition de la nécro-masse des espèces ...

    African Journals Online (AJOL)


    31 juil. 2015 ... Influence of litter decomposition of plant species on the pH and the genetic structure of bacterial communities of a lixisol soil in Senegal. ABSTRACT. Objectives: This study was conducted to follow the influence of Faidherbia albida A. CHEV., Azadirachta indica A. JUSS., Casuarina equisetifolia FORSK., ...

  6. Species of beetles (Coleoptera; Scarabaeidae associated to banana (Musa spp. in Ceballos, Ciego de Avila, Cuba

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    Maria Luisa Sisne Luis


    Full Text Available A white light trap was placed in bananas plantations, according to Sisne, 2009 and MINAG, 1985, in the Citric enterprise of Ciego de Ávila during the period between May and July of 2010 with the objective of determining the composition of genus and species of the order Coleoptera family Scarabaeidae associated to the agroecosystem. The species Cyclocephala cubana Chapin, Phyllophaga puberula Duval, and Phyllophaga patruelis Chev. are associated to bananas crops in these areas.

  7. Allelopathic effects of the invasive Prosopis juliflora (Sw.) DC. on selected native plant species in Middle Awash, Southern Afar Rift of Ethiopia


    Samuel Getachew; Sebsebe Demissew; Tadesse Woldemariam


    The allelopathic effects of the invasive Prosopis juliflora (Sw.) DC. was studied on seed germination and seedling growth of Acacia nilotica(L.) Willd. ex Del., Acacia tortilis (Forssk.) Hayne, Cenchrus ciliaris L. and Enteropogon rupestris (J.A. Schmidt) A. Chev. Vegetation sampling in different habitat types in the area was made to identify the target plant species. Comparison of canopy characteristics among P. juliflora, A. nilotica and A. tortilis was also made to observe differences if a...

  8. Influence de la décomposition de la nécro-masse des espèces ...

    African Journals Online (AJOL)

    Objectifs: L'objectif de cette étude est de suivre l'influence des litières de Faidherbia albida A. CHEV., Azadirachta indica A. JUSS., Casuarina equisetifolia FORSK., Andropogon gayanus KUNTH. et Eragrostis tremula STEUD. sur le pH du sol et la structure génétique des communautés bactériennes d'un sol ferrugineux ...

  9. Influence of wood structure on wood properties of tropical species


    Baar, Jan


    The presented thesis is focused on aesthetical and acoustic properties of tropical wood. The discussed tropical species are utilized in Europe mainly for their unusual appearance and colour in joinery and furniture production. The irreplacable acoustic properties like low internal friction predestine specific species for production of musical instruments. The colour of six selected tropical species - jatoba (Hymenea courbaril L.), massaranduba (Manilkara bidentata A. Chev.), muiracatiara (Ast...

  10. Diversité floristique sous canopée en plantation forestière de Mangombe-Edea (Cameroun

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    Makombu, G.


    Full Text Available Floristic diversity under canopy in forest plantation of Mangombe-Edea (Cameroon. Trees plantation of Mangombe is situated in rain forest of low altitude. Six plots among which one of Mansonia altissima (A.Chev. A.Chev., 2 of Lovoa trichilioides Harms, 3 of Terminalia ivorensis A.Chev. and one perturbed natural forest are concerned by this study. The work consisted to the evaluation of the floristic diversity under canopy in order to appreciate the influence of forest plantation on natural regeneration. A total of 26 families, 42 genders and 46 species were censured. Meliaceae and Apocynaceae are present in all the plots. In plot one of T. ivorensis, M. altissima and natural forest, the low value of equitability of Pielou traduces the dominance of flora by few species and the transitory situation of the ecosystem. On contrary the rest of plots present a good repartition of individuals among the species. One can notice a weak organization of the ecologic system in M. altissima plot, this corresponds to favourable conditions of environment for installation of many species represented by a few number of individuals. Shannon indices, relatively low in plot one of T. ivorensis characterize an ecosystem where one species is dominant. Globally, the regeneration under canopy is reconstituted progressively and remains less diversified than the nearest natural forest. Creation of genetic pool through selective entertainment under canopy will permit polycyclic management of plots for sustainable production of wood.

  11. Raleo de frutos en kiwi


    Godoy, Carlos; Arpaia, Rodolfo; Tognetti, Jorge


    Durante la temporada 1999-2000 un lote de plantas de kiwi (Actinidia deliciosa (A. Chev.) C. F. Liang et A. R. Ferguson var. deliciosa cv Hayward) fue sometido a tres intensidades de raleo: 30, 40 y 50 frutos/m2 a los 19 días post-floración. Se evaluó la calidad de los frutos desarrollados en 3 tipos de ramificación lateral: fuerte, medio y débil. Se registró la evolución del crecimiento del fruto. Se de...

  12. Scarabaeidae species associate to guava ( Psidium guajava L. in Ciego de Ávila, Cuba

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    Maria Luisa Sisne Luis


    Full Text Available Se colocó una trampa de luz blanca en las plantaciones de la Guayaba (Psidium guajava L., según establece Sisne, 2009 y MINAG, 1985, en la Empresa Cítricos de Ciego de Ávila durante el período comprendido entre mayo y julio del año 2010 con el objetivo de determinar la composición de géneros y especies del orden Coleoptera familia Scarabaeidae asociadas al agroecosistema. Se determinó que las especies Cyclocephala cubana Chapin, Phyllophaga puberula Duval, y Phyllophaga patruelis Chev. están asociadas al cultivo de la Guayaba en estas áreas.

  13. A direct-sensing galactose chemoreceptor recently evolved in invasive strains of Campylobacter jejuni (United States)

    Day, Christopher J.; King, Rebecca M.; Shewell, Lucy K.; Tram, Greg; Najnin, Tahria; Hartley-Tassell, Lauren E.; Wilson, Jennifer C.; Fleetwood, Aaron D.; Zhulin, Igor B.; Korolik, Victoria


    A rare chemotaxis receptor, Tlp11, has been previously identified in invasive strains of Campylobacter jejuni, the most prevalent cause of bacterial gastroenteritis worldwide. Here we use glycan and small-molecule arrays, as well as surface plasmon resonance, to show that Tlp11 specifically interacts with galactose. Tlp11 is required for the chemotactic response of C. jejuni to galactose, as shown using wild type, allelic inactivation and addition mutants. The inactivated mutant displays reduced virulence in vivo, in a model of chicken colonization. The Tlp11 sensory domain represents the first known sugar-binding dCache_1 domain, which is the most abundant family of extracellular sensors in bacteria. The Tlp11 signalling domain interacts with the chemotaxis scaffolding proteins CheV and CheW, and comparative genomic analysis indicates a likely recent evolutionary origin for Tlp11. We propose to rename Tlp11 as CcrG, Campylobacter ChemoReceptor for Galactose.

  14. A network characteristic that correlates environmental and genetic robustness.

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    Zeina Shreif


    Full Text Available As scientific advances in perturbing biological systems and technological advances in data acquisition allow the large-scale quantitative analysis of biological function, the robustness of organisms to both transient environmental stresses and inter-generational genetic changes is a fundamental impediment to the identifiability of mathematical models of these functions. An approach to overcoming this impediment is to reduce the space of possible models to take into account both types of robustness. However, the relationship between the two is still controversial. This work uncovers a network characteristic, transient responsiveness, for a specific function that correlates environmental imperturbability and genetic robustness. We test this characteristic extensively for dynamic networks of ordinary differential equations ranging up to 30 interacting nodes and find that there is a power-law relating environmental imperturbability and genetic robustness that tends to linearity as the number of nodes increases. Using our methods, we refine the classification of known 3-node motifs in terms of their environmental and genetic robustness. We demonstrate our approach by applying it to the chemotaxis signaling network. In particular, we investigate plausible models for the role of CheV protein in biochemical adaptation via a phosphorylation pathway, testing modifications that could improve the robustness of the system to environmental and/or genetic perturbation.

  15. Essential oil of three Uvaria species from Ivory Coast. (United States)

    Muriel, Koffi A; Félix, Tonzibo Z; Figueredo, Gilles; Chalard, Pierre; N'guessan, Yao T


    Different parts of Uvaria ovata (Dunals) A, U. anonoides Baker f. and U. tortilis A. Chev were collected from Ivory Coast, in Toumodi (center), Agboville (south-east) and Sikensi (south), respectively. The essential oils, obtained by hydrodistillation using a Clevenger-type apparatus, were investigated by CG and CG/MS. The proportion of the chromatographed constituents identified varied from 92.5% to 98.5%. For U. ovata, the root bark oil comprised mainly camphene (10.2%), beta-pinene (10.1%), epi-alpha-cadinol (13.2%) and intermedeol (9.7%), while the oil of the stem bark was dominated by epi-alpha-cadinol (27.3%), intermedeol (11.9%) and benzyl benzoate (13.4%). The oil of the leaves showed beta-caryophyllene (15.6%), germacrene D (24.2%) and benzyl benzoate (18.3%) as the most abundant constituents. The leaf oil of U. anonoides was rich in 2,5-dimethoxy-p-cymene (15.5%), bicyclogermacrene (21.3%) and benzyl benzoate (8.7%), while, gamma-terpinene (31.7%), beta-caryophyllene (23.9%) and germacrene D (15.8%) constituted the main components of the stem bark oil of U. tortilis.

  16. Anti-Fungal Activity and Allelopathic Influence of Vitex agnus-castus L. (Verbenaceae Essential Oils on Actinidia deliciosa in vitro Culture

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    N. Ya. Levchyk


    Full Text Available The results of research of Vitex agnus-castus L. plants from the collection of M. M. Gryshko National Botanical Garden, NAS of Ukraine are given. The species belongs to a group of prospective essential oil plants which are characterized by valuable medicinal, food, aromatic, honey, technical and decorative properties, and can be used in many industries, including pharmaceutical, cosmetic and food. The quantitative content and qualitative composition of the vegetating plant’s essential oil are determined, its antifungal influence on the cultures of Aspergillus niger, Alternaria alternatа andFusarium culmorum is assessed. Antifungal properties of V. agnus-castus essential oil were used to sterilize Actinidia deliciosa (A. Chev C.F. Liang & A.R. Fergusonexplants introduced in vitro. V. agnus-castusessential oil is shown to have allelopathic effect on A. deliciosa plants. The possibility of using the oil in vitro to cultivate A. deliciosa callus as a source of bioactive substances and to enhance the effectiveness of biotechnological methods of plant propagation is discussed.

  17. Antinociceptive Effect of Tephrosia sinapou Extract in the Acetic Acid, Phenyl-p-benzoquinone, Formalin, and Complete Freund’s Adjuvant Models of Overt Pain-Like Behavior in Mice

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    Renata M. Martinez


    Full Text Available Tephrosia toxicaria, which is currently known as Tephrosia sinapou (Buc’hoz A. Chev. (Fabaceae, is a source of compounds such as flavonoids. T. sinapou has been used in Amazonian countries traditional medicine to alleviate pain and inflammation. The purpose of this study was to evaluate the analgesic effects of T. sinapou ethyl acetate extract in overt pain-like behavior models in mice by using writhing response and flinching/licking tests. We demonstrated in this study that T. sinapou extract inhibited, in a dose (1–100 mg/kg dependent manner, acetic acid- and phenyl-p-benzoquinone- (PBQ- induced writhing response. Furthermore, it was active via intraperitoneal, subcutaneous, and peroral routes of administration. T. sinapou extract also inhibited formalin- and complete Freund’s adjuvant- (CFA- induced flinching/licking at 100 mg/kg dose. In conclusion, these findings demonstrate that T. sinapou ethyl acetate extract reduces inflammatory pain in the acetic acid, PBQ, formalin, and CFA models of overt pain-like behavior. Therefore, the potential of analgesic activity of T. sinapou indicates that it deserves further investigation.

  18. Identité et écologie des espèces forestières commerciales d'Afrique centrale : le cas de Milicia spp. (synthèse bibliographique

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    Daïnou, K.


    Full Text Available Identity and ecology of Central African timber tree species: the case of Milicia spp., a review. Iroko designates the two African tree species Milicia excelsa (Welw. C.C.Berg and Milicia regia (A.Chev. C.C.Berg known as highly valuable in the timber trade. Despite its economical importance and a decrease in population densities due to exploitation, there is a significant lack of ecological and sylvicultural knowledge required for a sustainable management of iroko. In West Africa, M. excelsa has received more attention from scientists than M. regia, but several topics clearly need further investigations or outcomes cannot be transferred in the context of Central African rainforests. A first thing to verify is whether speciation really occurred in the genus Milicia: morphological differences between the two species are very low, and a revision in this genus may lead to some rearrangements of conservatory and management policies related to this taxonomic group. Furthermore, (i patterns related to the reproductive phenology and its controlling factors, (ii gene flow among and between populations and individuals regarding life history traits, influence of human activities and paleoecological perturbations, and (iii dynamics of seedling populations are among aspects that require emphasis in order to propose efficient tools for forest managers. Unless scientists provide these crucial data, the abundance of iroko in tropical rainforests will only depend on expensive plantations activities.

  19. Metabolic Relations between Methylxanthines and Methyluric Acids in Coffea L. 1 (United States)

    Petermann, Joseph B.; Baumann, Thomas W.


    Metabolism of purine alkaloids in the leaves of Coffea dewevrei De Wild et Durand var excelsa Chev, Coffea liberica Bull ex Hiern and Coffea abeokutae Cramer was studied by analyzing leaf discs collected during vegetative development and by feeding the following radioactive tracers: [14C]theobromine, [14C]caffeine, and [14C]theacrine (1,3,7,9-tetramethyluric acid). Their principal metabolites were quantitatively and qualitatively determined. All three species convert the precursors to the same radioactive products, and proceed through the same four maturity stages characterized by the alkaloid accumulation pattern and by a particular transformation potency: (stage 1) young plant accumulating caffeine, transforms theobromine to caffeine; (stage 2) caffeine is gradually replaced by theacrine, theobromine and caffeine are converted to theacrine; (stage 3) theacrine disappears whereas liberine (O(2), 1,9-thrimethyluric acid) accumulates, theacrine is metabolized to liberine; (stage 4) branched-out plant containing liberine but no theacrine, caffeine is converted rapidly to liberine via theacrine. Methylliberine (O(2),1,7,9-tetramethyluric acid), presumably the direct precursor of liberine, is occasionally found in low concentrations at stage 3 and 4. The collective term `liberio-excelsoid' introduced by geneticists for the numerous races or species of Pachycoffea is in accordance with the phytochemical equality found in this work. PMID:16663351

  20. Metabolic Relations between Methylxanthines and Methyluric Acids in Coffea L. (United States)

    Petermann, J B; Baumann, T W


    Metabolism of purine alkaloids in the leaves of Coffea dewevrei De Wild et Durand var excelsa Chev, Coffea liberica Bull ex Hiern and Coffea abeokutae Cramer was studied by analyzing leaf discs collected during vegetative development and by feeding the following radioactive tracers: [(14)C]theobromine, [(14)C]caffeine, and [(14)C]theacrine (1,3,7,9-tetramethyluric acid). Their principal metabolites were quantitatively and qualitatively determined. All three species convert the precursors to the same radioactive products, and proceed through the same four maturity stages characterized by the alkaloid accumulation pattern and by a particular transformation potency: (stage 1) young plant accumulating caffeine, transforms theobromine to caffeine; (stage 2) caffeine is gradually replaced by theacrine, theobromine and caffeine are converted to theacrine; (stage 3) theacrine disappears whereas liberine (O(2), 1,9-thrimethyluric acid) accumulates, theacrine is metabolized to liberine; (stage 4) branched-out plant containing liberine but no theacrine, caffeine is converted rapidly to liberine via theacrine. Methylliberine (O(2),1,7,9-tetramethyluric acid), presumably the direct precursor of liberine, is occasionally found in low concentrations at stage 3 and 4.The collective term ;liberio-excelsoid' introduced by geneticists for the numerous races or species of Pachycoffea is in accordance with the phytochemical equality found in this work.

  1. The Distribution, Incidence, Natural Reservoir Hosts and Insect Vectors of Rice Yellow Mottle Virus (RYMV, Genus Sobemovirus in Northern Nigeria

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    Abo, ME.


    Full Text Available Field visits and surveys were carried out in Niger, Kano, Bauchi and Gombe states of northern Nigeria at tillering and panicle initiation stages of rice in the years 2000 and 2001 to determine the distribution, host plants and occurrence of insect vectors of Rice Yellow Mottle Virus (RYMV. Farmers' cultural practices and field situations were also assessed. Visual inspection based on the Standard Evaluation Scale (SES and enzyme linked immunosorbent assay (ELISA methods were used in detecting RYMV infection. RYMV presence was established in all the four states surveyed. The virus was widely distributed in Kano state. The insect vectors of RYMV, such as Trichispa sericea Guerin, Chaetocnema pulla Chapius, Chnootriba similis Thunberg and Conocephalus longipennis de Haan, were found in the 4 states. Outbreaks of T. sericea occurred in many farmers' fields in Kano state. RYMV was detected more frequently on Oryza sativa L. than on O. longistaminata Chev. & Roehr and Echinochloa pyramidalis Hitche and Chase.Virus infection was not established in any other grass species, sedges and broadleaf plants tested. It is evident therefore, that RYMV has a narrow host range and is found more frequently in the Oryzeae.

  2. Effects of Hydrogen Cyanamide on the Floral Morphogenesis of Kiwifruit Buds Efectos de la Cianamida de Hidrógeno sobre la Morfogénesis Floral de Kiwi

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    Hakan Engin


    Full Text Available The influence of hydrogen cyanamide (HC on the flower bud development of kiwifruit (Actinidia deliciosa (A. Chev. C.F. Liang & A.R. Ferguson. ‘Hayward’ was studied. The bud samples were taken every 5-10 d starting from dormant season (March and fixed in FAA (10% formalin, 50% ethanol, 5% glacial acetic acid. Flower bud development was compared in three HC concentrations and the control. 1%, 2%, and 3% of HC was applied 35 d before the expected natural bud break. During the onset of bud break, only 57.6% of control buds had sepal primordia developed. On the other hand, HC treated buds had almost completed their stamen formation and started stigma primordia. When the control vines were in advanced bud break, gynoecial plateau already began to form in the vines treated with 2 and 3% HC. Vines treated with 1% HC lagged a little behind and had not started developing the gynoecial plateau. As the bud developed from the open cluster to the tight bud stage, the differences between the control and HC treated plants were more distinct. However, there were no differences between HC treatments as the ovule initiation took place in the buds.El presente estudio evalúa la influencia de la aplicación de cianamida de hidrogeno (HC sobre el desarrollo de las yemas florales de kiwi (Actinidia deliciosa (A. Chev. C.F. Liang & A.R. Ferguson cv. Hayward. Las muestras de yemas se tomaron cada 5-10 días comenzando en la época de dormancia en marzo y se fijaron en FAA (10% formaldehido, 50% etanol, 5% ácido acético glacial. Se comparó el desarrollo de las yemas florales en tres concentraciones de HC y el control. Se aplicó HC al 1%, 2% y 3% 35 días antes del brote natural de las yemas. En el momento de la apertura de las yemas, sólo el 57,6% de las yemas de control habían desarrollado los primordios de los sépalos. Por el contrario, las yemas tratadas con HC casi habían completado la formación de estambres y habían empezado el desarrollo de primordios

  3. La métropolisation en Pologne : le fonctionnement et l’avenir des espaces métropolitains polonais

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    Robert Pyka


    Full Text Available La Pologne, comme tous les autres pays européens, est exposée au processus de métropolisation qui modifie l’espace et le fonctionnement des villes et des agglomérations polonaises. Même s’il reste difficile d’affirmer qu’il existe en Pologne des métropoles au sens propre du terme, il est sûr que les villes polonaises et les agglomérations les plus importantes développent des fonctions métropolitaines et deviennent des pôles de croissance économique importants aux niveaux régional et national.Les recherches menées permettent d’identifier en Pologne environ sept espaces métropolitains, dont les plus importants restent Varsovie et la Conurbation Silésienne de Katowice.Le phénomène de métropolisation constitue la source de multiples opportunités mais entraîne aussi plusieurs effets pervers ainsi que des coûts sociaux. C’est pourquoi il apparaît aussi important de créer des outils institutionnels de gestion intégrée des espaces métropolitains. Aujourd’hui il manque en Pologne de tels outils institutionnels, la loi d’agglomération qui correspondrait à la loi Chevènement n’existe toujours pas et l’intercommunalité qui se développe difficilement reste au niveau des syndicats à vocation unique sans sources financières propres.Cette situation est particulièrement problématique pour la « Métropole Silesia » qui fonctionne sur le territoire de la Conurbation Silésienne et, se composant de 14 villes indépendantes, rencontre des difficultés importantes dans la coordination de ses politiques urbaines.Poland like other European countries is the place of occurrence of metropolization phenomenon which influences the space and functioning of Polish cities and agglomerations. Although it is really difficult to answer to the question concerning the existence of metropolis in the full sense of this word in Polish space we may be certain that the biggest Polish agglomerations develop metropolitan

  4. Coupling of physiological and proteomic analysis to understand the ethylene- and chilling-induced kiwifruit ripening syndrome

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    Ioannis S Minas


    Full Text Available Kiwifruit (Actinidia deliciosa (A. Chev. C.F. Liang et A.R. Ferguson, cv. ‘Hayward’ is classified as climacteric fruit and the initiation of endogenous ethylene production following harvest is induced by exogenous ethylene or chilling exposure. To understand the biological basis of this ‘dilemma’, kiwifruit ripening responses were characterized at 20 oC following treatments with exogenous ethylene (100 μL L-1, 20 oC, 24 h or/and chilling temperature (0 oC, 10 d. All treatments elicited kiwifruit ripening and induced softening and endogenous ethylene biosynthesis, as determined by 1-aminocyclopropane-1-carboxylic acid (ACC content and ACC synthase (ACS and ACC oxidase (ACO enzyme activities after 10 d of ripening at 20 oC. Comparative proteomic analysis using two-dimensional gel electrophoresis (2DE-PAGE and nanoscale liquid chromatography coupled to tandem mass spectrometry (nanoLC-MS/MS revealed 81 kiwifruit proteins associated with ripening. Thirty-one kiwifruit proteins were identified as commonly regulated by the three treatments accompanied by dynamic changes of 10 proteins specific to exogenous ethylene, 2 to chilling treatment and 12 to their combination. Ethylene and/or chilling-responsive proteins were mainly involved in disease/defense, energy, protein destination/storage and cell structure/cell wall. Interactions between the identified proteins were demonstrated by bioinformatics analysis, allowing a more complete insight into biological pathways and molecular functions affected by ripening. The present approach provides a quantitative basis for understanding the ethylene- and chilling-induced kiwifruit ripening and climacteric fruit ripening in general.

  5. Outcomes of the distal intraarticular humeral fractures treated by olecranon osteotomy

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    Erhan Yılmaz


    Full Text Available Objectives: To evaluate the management and outcome of intraarticular fractures of the distal humerus treated by open reduction and internal fixation using the olecranon osteotomy technique. Materials and methods: Twenty-one patients with in-traarticular fractures of the distal humerus were treated by open reduction and internal fixation. The mean age of the patients was 41.6 years and the mean follow-up pe-riod was 25.3 months. All fractures were type C accord-ing to the AO/ASIF fracture classification system. Chev-ron type olecranon osteotomy was performed within 12-24 h after the injury in all cases but 4 of them. Physical and radiological examination of patients with the appro-priate range checks were made.Results: All fractures united within average duration of 3.2 months. Excellent or good results were found in pa-tients less than 50 years-old, in women, when passing time from injury to surgery was within 12 hours and when early mobilization was achieved. The complica-tions were seen as 2 (9.6% transient neuropraxia of the ulnar nerve, 2 (9.6% failure of fixation, 1 (4.8% het-erotopic ossification and 1 (4.8% olecranon non-union. Fracture type (C1 and time from occurrence of injury to surgery (<12 hours are the main prognostic factors for achieving the excellent/ good functional results.Conclusions: The critical factors for a successful out-come of intraarticular fractures of the distal humerus in-cluded meticulous surgical technique, stable internal fix-ation, surgical experimentation and early controlled postoperative mobilization.

  6. Allelopathic effects of the invasive Prosopis juliflora (Sw. DC. on selected native plant species in Middle Awash, Southern Afar Rift of Ethiopia

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    Samuel Getachew


    Full Text Available The allelopathic effects of the invasive Prosopis juliflora (Sw. DC. was studied on seed germination and seedling growth of Acacia nilotica(L. Willd. ex Del., Acacia tortilis (Forssk. Hayne, Cenchrus ciliaris L. and Enteropogon rupestris (J.A. Schmidt A. Chev. Vegetation sampling in different habitat types in the area was made to identify the target plant species. Comparison of canopy characteristics among P. juliflora, A. nilotica and A. tortilis was also made to observe differences if any in canopy closure. P. juliflora was recorded in all habitat types in highest density and observed affecting the plant diversity there in. Its growth characteristics and dense thicket formation restrict light to the ground flora and hence diminishes plant diversity. Leaf, bark and root aqueous extract of P. juliflora at 0, 0.5, 0.8, 1, 2 and 6% wereprepared and their effect studied on germination percentage and seedling growth of the study plant species. Germination of A. nilotica and A. tortilis was not affected by all aqueous extracts of different organ parts of P. juliflora while leaf and root extracts at higher concentrations inhibited germination of C. ciliaris and E. rupestris. Shoot and root growth of the study species were inhibited by leaf and root at higher concentrations. Seed germination of all species except A. nilotica was inhibited by soil amended with decaying plant parts and under canopy soil. The effect is species specific and annuals (grasses and herbs were affected more than perennials. Leaf seems to contain greater number/amount of inhibitors than does root and bark. Bark seems to contain the least. Heavy accumulation of toxic substances at under canopy soil of P. juliflora may be one of the reasons for its invasiveness and low plant diversity.

  7. Essential oils from the leaves of six medicinal plants of Nigeria. (United States)

    Ogunwande, Isiaka A; Avoseh, Nudewhenu O; Flamini, Guido; Hassan, Alimot-Sadiat O; Ogunmoye, AbdulRazaq O; Ogunsanwo, Akindele O; Yusuf, Kamorudeen O; Kelechi, Atuonwu O; Tiamiyu, Zainab A; Tabowei, Godgift O


    The chemistry of Cassia siamea L., C. occidentalis L. (Fabaceae), Cnestis ferruginea Vahl ex DC (Connaraceae), Anthocleista djalonensis A. Chev (Loganiaceae), Solanum torvum Swartz and S. erianthum G. Don (Solanaceae) volatiles grown in Nigeria have been studied. The essential oils were obtained by hydrodistillation and analyzed by GC and GC-MS. The main compounds of C. siamea were (E)-geranyl acetone (5.8%), 1-octen-3-ol (5.8%), linalool (7.8%), iso-italicene (15.4%) and (E)-beta-damascenone (11.0%). On the other hand, C. occidentalis consisted mainly of (E)-geranyl acetone (8.0%), hexahydrofarnesylacetone (24.0%) and (E)-phytol acetate (40.7%). The oil of C. ferruginea was comprised mainly of (E)-geranyl acetone (13.7%), (E)-alpha-ionone (9.5%), phytol (5.8%), pentadecanal (6.1%) and 1-octen-3-ol (5.5%). The main compounds of A. djalonensis were alpha-humulene (31.9%), beta-caryophyllene (17.8%), humulene epoxide II (12.7%) and caryophyllene oxide (5.9%). The main volatiles of S. torvum were (E)-phytol acetate (38.7%), pentadecanal (25.3%) and (E)-geranyl acetone (5.0%). Apart from methyl salicylate (4.5%), tetradecanal (2.2%), 2-pentyl furan (1.8%), hexahydrofarnesylacetone (1.6%) and hexadecanal (1.1%), all other compounds were either present in trace quantity or in amounts less than 1%. On the other hand, alpha-humulene (46.6%) and beta-caryophyllene (20.6%) were the compounds occurring in higher quantities in S. erianthum. The volatile oil contents of Cassia siamea, Cnestis ferruginea, Anthocleista djalonensis and Solanum torvum are being reported for the first time.


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    José Alves Júnior

    Full Text Available ABSTRACT African mahogany (Khaya ivorensis A. Chev. is a tree species that has been increasing in Brazilian commercial planting. However, the lack of water and nutrition are great obstacles for crop production. The aim of this study was to evaluate the growth of young mahogany plants submitted to drip irrigation and topdressing. The experimental design was of randomized blocks, with three repetitions in subdivided plots. Treatments consisted of drippers: 1, 2 and 3plt-1; flows: 2, 4 and 8L h-1, and a treatment without irrigation. For topdressing, subplots levels were, as follows: 1 17.5 and 25.2; 2 35.1 and 50.1; 3 52.5 and 75.0; 4 70.0 and 100.2; and 5 87.5 and 125.1 g plant-1 N and K2O, respectively, divided into five bimonthly applications, which started in the 4th month after planting. Plant height, diameter at root collar and at breast height (DBH, and stem height were evaluated. Results showed statistically significant differences (P>0.05 between irrigated and non-irrigated plants. Mean plant height ranged (from 2 to 20 months in field from 0.33 to 3.25 and 2.67m for irrigated and non-irrigated plants, respectively. Mean stem height ranged from 0.23m to 0.87 and 0.71m for irrigated and non-irrigated plants, respectively. Thus, irrigation with 1 dripper per tree and flow of 2L h-1 was able to supply mahogany water requirements in the first two years in field. Trees have not responded to N and K topdressing at the beginning of the cycle.

  9. Influence of tropical leaf litter on nitrogen mineralization and community structure of ammonia-oxidizing bacteria

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    Diallo, MD.


    Full Text Available Description of the subject. The present study concerns the relationships among leaf litter decomposition, substrate quality, ammonia-oxidizing bacteria (AOB community composition and nitrogen (N availability. Decomposition of organic matter affects the biogeochemical cycling of carbon (C and N. Since the composition of the soil microbial community can alter the physiological capacity of the community, it is timely to study the litter quality effect on N dynamic in ecosystems. Objectives. The aim of this study was to determine the influence of leaf litter decomposition on N mineralization. The specific objectives of this study were to evaluate the influence of the litter biochemistry of five plants species (Faidherbia albida A.Chev., Azadirachta indica A.Juss., Casuarina equisetifolia L., Andropogon gayanus Kunth and Eragrostis tremula Hochst. ex Steud. on N mineralization in a tropical ferrous soil (Lixisol, nitrification, and genetic diversity of ammonia-oxidizing bacteria. Denaturing gradient gel electrophoresis (DGGE of amplified fragments of genes coding for 16S rRNA was used to study the development of bacterial communities during decomposition of leaf litter in soils. Method. Community structure of AOB was determined at two time periods: day 0 and day 140. Ten strains were tested and each of these strains produced a single band. Thus, DGGE DNA band patterns were used to estimate bacterial diversity. Plant secondary compounds such as polyphenols are purported to influence nutrient cycling by affecting organic matter degradation, mineralization rates, N availability and humus formation. In a laboratory study, we investigated the influence of six phenolic acids (ferulic, gallic, vanillic, syringic, p-coumaric and p-HBA acids commonly found in the plant residues on N mineralization and NH4+ and NO3- production in soils. Results. The results showed that litter type did affect soil nitrification. Faidherbia albida litter was associated with

  10. Analysis of the ArcA regulon in anaerobically grown Salmonella enterica sv. Typhimurium

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    Porwollik Steffen


    Full Text Available Abstract Background Salmonella enterica serovar Typhimurium (S. Typhimurium is a Gram-negative pathogen that must successfully adapt to the broad fluctuations in the concentration of dissolved dioxygen encountered in the host. In Escherichia coli, ArcA (Aerobic Respiratory Control helps the cells to sense and respond to the presence of dioxygen. The global role of ArcA in E. coli is well characterized; however, little is known about its role in anaerobically grown S. Typhimurium. Results We compared the transcriptional profiles of the virulent wild-type (WT strain (ATCC 14028s and its isogenic arcA mutant grown under anaerobic conditions. We found that ArcA directly or indirectly regulates 392 genes (8.5% of the genome; of these, 138 genes are poorly characterized. Regulation by ArcA in S. Typhimurium is similar, but distinct from that in E. coli. Thus, genes/operons involved in core metabolic pathways (e.g., succinyl-CoA, fatty acid degradation, cytochrome oxidase complexes, flagellar biosynthesis, motility, and chemotaxis were regulated similarly in the two organisms. However, genes/operons present in both organisms, but regulated differently by ArcA in S. Typhimurium included those coding for ethanolamine utilization, lactate transport and metabolism, and succinate dehydrogenases. Salmonella-specific genes/operons regulated by ArcA included those required for propanediol utilization, flagellar genes (mcpAC, cheV, Gifsy-1 prophage genes, and three SPI-3 genes (mgtBC, slsA, STM3784. In agreement with our microarray data, the arcA mutant was non-motile, lacked flagella, and was as virulent in mice as the WT. Additionally, we identified a set of 120 genes whose regulation was shared with the anaerobic redox regulator, Fnr. Conclusion(s We have identified the ArcA regulon in anaerobically grown S. Typhimurium. Our results demonstrated that in S. Typhimurium, ArcA serves as a transcriptional regulator coordinating cellular metabolism, flagella

  11. Arabinogalactan proteins in plants

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    Ewa Szczuka


    Full Text Available AGPs (arabinogalactan-proteins are the major constituent of arabic gum and have been used as emulsifiers and stabilizing agents. They are also one of the most abundant and heterogeneous class forming a large family of proteoglycans that sculpt the surface not only of plant but also of all eukaryotic cells. Undoubtedly, AGPs appear in numerous biological processes, playing diverse functions. Despite their abundance in nature and industrial utility, the in vivofunction(s of AGPs still remains unclear or even unknown. AGPs are commonly distributed in different plant organs and probably participate in all aspects of plant growth and development including reproduction (e.g. they are present in the stigma including stigma exudates, and in transmitting tissues in styles, pollen grains, and pollen tubes. The functions and evident involvement of AGPs in sexual plant reproduction in a few plant species as Actinidia deliciosa (A.Chev. C.F.Liang & A.R.Ferguson, Amaranthus hypochondriacus L., Catharanthus roseus (L. G.Don, Lolium perenneL. and Larix deciduaMill. are known from literature. The localization of two kinds of AGP epitopes, recognized by the JIM8 and JIM13 mAbs, in anatomically different ovules revealed some differences in spatial localization of these epitopes in ovules of monocots Galanthus nivalis L. and Galtonia candicans (Baker Decne. and dicots like Oenothera species and Sinapis albaL. A detailed study of the localization of AGPs in egg cells, zygotes, including the zygote division stage, and in two-celled proembryos in Nicotiana tabacumL. prompts consideration of the necessity of their presence in the very early steps of ontogenesis. The selective labeling obtained with AGP mAbs JIM8, JIM13, MAC207, and LM2 during Arabidopsis thaliana(L. Heynh. development suggests that some AGPs can be regarded as molecular markers for gametophytic cell differentiation. Moreover, the results show evident differences in the distribution of specific AGP

  12. Assessment of Attractiveness of Plants as Roosting Sites for the Melon Fly, Bactrocera cucurbitae, and Oriental Fruit Fly, Bactrocera dorsalis (United States)

    McQuate, Grant T.; Vargas, Roger I.


    ), Brazilian pepper tree, Schinus terebinthifolius Raddi (Sapindales: Anacardiaceae), ti plant, Cordyline terminate (L.) Chev.(Liliales: Liliaceae), guava and several Citrus spp. were identified as preferred roosting hosts for oriental fruit fly. Guava had not previously been identified as a preferred roosting host for melon fly. Other than for the use of panax as a roosting host, there has previously been little attention to roosting hosts for oriental fruit fly. Establishment of preferred roosting hosts as crop borders may help to improve suppression of both fruit fly species by providing sites for bait spray applications. Further research is needed to assess the use of vegetation bordering other host crops as roosting hosts, especially for oriental fruit fly. PMID:20334596

  13. Diversidad, composición y estructura de un hábitat altamente amenazado: los bosques estacionalmente secos de Tarapoto, Perú

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    Roosevelt García-Villacorta


    Full Text Available Entre marzo y abril de 2006, la flora de los bosques estacionalmente secos en Tarapoto, San Martín fue estudiada en diez localidades. En cada una de estas localidades se estableció una parcela de 0,1 ha; cada tallo mayor de 2,5 cm de diámetro fue medido, contado e identificado a especie. Se encontraron 146 especies en 2814 individuos. En toda la zona de estudio, Myrtaceae fue la familia más diversa con 14 especies, seguida por Leguminosae con 12 especies. Igualmente, Annonaceae y Myrtaceae fueron las familias más abundantes en numero de tallos en toda la zona de estudio (461, y 412 tallos totales, mientras que Sapotaceae, con sólo 160 tallos totales, tuvo el valor más alto en área basal, debido a la Quinilla, Manilkara bidentata (A. DC. A. Chev., el árbol más importante en la estructura de los bosques estacionalmente secos de Tarapoto. Dos especies estuvieron presentes en todos los sitios de estudio: Coccoloba sp. 1, (Polygonaceae y Oxandra espintana (Spruce ex Benth. Baill. (Annonaceae, mientras que 53 especies ocurrieron en un solo sitio. Los bosques estacionalmente secos de Tarapoto presentan una diversidad intermedia comparada con otros bosques secos del Neotrópico y similar diversidad a los bosques secos del Pacífico Peruano. La comunidad de árboles en estos bosques pertenece a especies de amplia distribución comparada con las especies de arbustos que tienen distribución restringida a los hábitats de bosques secos. En términos generales las áreas localizadas cerca de la carretera Tarapoto-Juanjui tienen el grado más alto de amenaza y perturbación debido a la extracción maderera y destrucción de hábitat para la creación de campos de cultivos agrícolas. Los bosques más representativos y mejor conservados de esta región se encuentran al Oeste y Sur de Picota, en el Área de Conservación Municipal El Quinillal, y en la cuenca del Río Bombonajillo y Ponasillo. Estos resultados resaltan la urgencia de conservar estos

  14. Changes in transcription of cytokinin metabolism and signalling genes in grape (Vitis vinifera L.) berries are associated with the ripening-related increase in isopentenyladenine. (United States)

    Böttcher, Christine; Burbidge, Crista A; Boss, Paul K; Davies, Christopher


    Cytokinins are known to play an important role in fruit set and early fruit growth, but their involvement in later stages of fruit development is less well understood. Recent reports of greatly increased cytokinin concentrations in the flesh of ripening kiwifruit (Actinidia deliciosa (A. Chev.) C.F. Liang & A.R. Ferguson) and grapes (Vitis vinifera L.) have suggested that these hormones are implicated in the control of ripening-related processes. A similar pattern of isopentenyladenine (iP) accumulation was observed in the ripening fruit of several grapevine cultivars, strawberry (Fragaria ananassa Duch.) and tomato (Solanum lycopersicum Mill.), suggesting a common, ripening-related role for this cytokinin. Significant differences in maximal iP concentrations between grapevine cultivars and between fruit species might reflect varying degrees of relevance or functional adaptations of this hormone in the ripening process. Grapevine orthologues of five Arabidopsis (Arabidopsis thaliana L.) gene families involved in cytokinin metabolism and signalling were identified and analysed for their expression in developing grape berries and a range of other grapevine tissues. Members of each gene family were characterised by distinct expression profiles during berry development and in different grapevine organs, suggesting a complex regulation of cellular cytokinin activities throughout the plant. The post-veraison-specific expression of a set of biosynthesis, activation, perception and signalling genes together with a lack of expression of degradation-related genes during the ripening phase were indicative of a local control of berry iP concentrations leading to the observed accumulation of iP in ripening grapes. The transcriptional analysis of grapevine genes involved in cytokinin production, degradation and response has provided a possible explanation for the ripening-associated accumulation of iP in grapes and other fruit. The pre- and post-veraison-specific expression of

  15. Integrated analysis of metabolites and proteins reveal aspects of the tissue-specific function of synthetic cytokinin in kiwifruit development and ripening. (United States)

    Ainalidou, Aggeliki; Tanou, Georgia; Belghazi, Maya; Samiotaki, Martina; Diamantidis, Grigorios; Molassiotis, Athanassios; Karamanoli, Katerina


    Fruit development and ripening depends on highly coordinated phyto-hormonal activities. Although the role of synthetic cytokinin N-(2-chloro-4-pyridyl)-N'-phenylurea (CPPU) in promoting fruit growth has been established, knowledge regarding the underlying mechanism is still lacking. Here, we characterize the effect of CPPU application 20d after full bloom at pre- and post-harvest biology of kiwifruit (Actinidia deliciosa [A. Chev.] C.F. Liang et A.R. Ferguson var. deliciosa cv. 'Hayward'). Data revealed that CPPU stimulates kiwifruit growth through the enlargement of small cells. During fruit development, the abundance of 16 proteins that are mainly related to defence was increased by CPPU while CPPU altered the expression of 19 polar metabolites in outer pericarp. Sugar homeostasis, cell wall modifications, TCA cycle and myo-inositol pathway were mostly affected by CPPU in kiwifruit during development. Upon postharvest ripening at 20°C following 2months of cold storage (0°C), CPPU suppressed ethylene production and retained central placenta softening, indicating that CPPU induced tissue-dependent disturbances in climacteric ripening. Nineteen central placenta proteins and up to 15 metabolites of outer pericarp and central placenta tissues were affected by CPPU in ripened kiwifruits. These observations amplified our understanding in the regulation of fruit development and ripening by exogenously supplied cytokinins. This study demonstrates that CPPU application, apart from fruit development, influenced also the kiwifruit climacteric ripening behaviour. An insight on the action of CPPU during kiwifruit development is provided, showing that it is partially based on a general stimulation of TCA cycle and myo-inositol pathway along with alternation in sugar and cell wall metabolism. Data also revealed that CPPU regulates ethylene biosynthesis and influences central placenta softening, indicating that this tissue may play a prominent role in kiwifruit ripening. Also

  16. Light quality management in fruit orchards: physiological and technological aspects Manejo de la calidad de la luz en huertos frutales: Aspectos fisiológicos y tecnológicos

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    Richard M. Bastías


    Full Text Available Light quality (sunlight spectrum management promises to provide a new technological alternative to sustainable production in horticultural crops. However, little information exists about physiological and technological aspects on light quality management in fruit crops. Sunlight composition changes widely in orchard canopies, inducing different plant responses in fruit trees mediated by phytochrome (PHY and cryptochrome (CRY activity. High proportion of far-red (FR in relation to red (R light increases shoot elongation, while blue (B light induces shoot dwarfing. Red and ultraviolet (UV light increases fruit skin anthocyanin synthesis, while FR light shows a negative effect. Red and B light can also alter leaf morpho-physiological traits in fruit trees, such palisade thickness, stomatal aperture, and chlorophyll content. Besides improvement of photosynthetically active radiation (PAR availability, the use of reflective films improves UV and R light proportion, with positive effects on PHY mediated-responses (fruit color, fruit weight, shoot growth, as reported in apple (Malus domestica Borkh., peach (Prunus persica (L. Batsch, and sweet cherry (Prunus avium (L. L.. Colored nets widely alter spectral light composition with effects on plant growth, yield, and quality in apple, kiwifruit (Actinidia deliciosa A. Chev. C.F. Liang & A.R. Ferguson, peach, and blueberry (Vaccinium corymbosum L. orchards. Mechanisms of colored nets seem to be associated to photosynthetic and morphogenetic process regulated by PAR availability, R/B light proportion, and CRY activity. Alteration of light quality affects significantly fruit tree plant responses and could be a useful tool for sustainable (e.g. lower use of chemicals and labor-practices management of yield and quality in modern orchards.El manejo de la calidad de la luz (espectro de la luz solar promete proveer una nueva alternativa tecnológica para la producción sostenible de cultivos hortícolas. Sin


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    Péricles de Carvalho Ferreira Neves


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    A produção de sementes híbridas de arroz, utilizando a técnica chinesa, requer uma grande quantidade de mão-de-obra e é cara. Alternativas para aumentar a taxa de polinização cruzada podem ajudar a reduzir tal custo. A Embrapa Arroz e Feijão desenvolve um projeto de produção de híbridos através da transferência de caracteres alogâmicos (comprimento de estigma e antera da Oryza longistaminata A. Chev. para a cultivada Oryza sativa L. O objetivo deste estudo foi determinar as correlações genética e fenotípica entre esses caracteres e os agronômicos. O. longistaminata foi cruzada com a O. sativa e retrocruzada duas vezes para a cultivada. Foram obtidas 25 linhagens F3:6 e estudadas as correlações entre os caracteres alogâmicos (comprimento de estigma, antera e espigueta e os agronômicos (comprimento de estigma, antera, espigueta, arista e panícula, esterilidade, degrane, altura de planta, perfilhos por planta, e exserção de panícula. O desenho experimental utilizado foi o de blocos ao acaso com quatro repetições. Os ensaios foram conduzidos em dois locais dentro da área experimental da Embrapa Arroz e Feijão. Em geral, foram observadas pequenas correlações genética e fenotípica entre caracteres alogâmicos e agronômicos. Elevada e significativa associação foi observada entre o comprimento de estigma e o de anteras, o comprimento de estigma e o de arista, o comprimento de antera e o de arista, e o comprimento de panícula e a altura de planta.

    PALAVRAS-CHAVE: Oryza longistaminata; taxa de autopolinização; arroz híbrido; produção de sementes.

  18. La ética hacia el futuro

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    Jaime Campos


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    El honor y la responsabilidad de haber sido elegido presidente del Círculo André Lambling me han conducido a reflexiones intelectuales sobre la moral en general y las éticas en particular, que han dado como resultado más interrogantes que respuestas.

    Comienzo por analizar dos hechos concretos: primero, el espíritu abierto de los miembros del Círculo que permitió a un médico no europeo orientar temporalmente esta asociación pluricultural construida alrededor de la inteligencia y del saber, y en segundo lugar un informe de Noelle Lenoir, dirigido al ex primer Ministro Francés Michel Rocard sobre una “ética biomédica a la francesa” que, en el capítulo dedicado a las relaciones Norte,c;ur, escribe: “Laética en los países pobres debería primero consistir en hacer llegar a la población los cuidados básicos, una higiene de vida aceptable, una alimentación sufIciente”, pero la divergencia de ideas está también presente en el seno de la alta burocracia, puesto que según el señor Chevénement “En todo el mundo hay que mantener referencia a valores universales”, porque la preservación de la vida, la búsqueda del bienestar y el amor por el conocimiento pertenecen a la humanidad. He juzgado entonces necesario consultar algunos autores a los cuales hago referencia, que influyeron de una u otra forma en esta exposición.

    Yo considero que en materia de ética, así como en varios campos del saber, lo absoluto no existe y es bueno recordar que, durante siglos, la moral ha estado basada en el resentimiento, en el placer de la delación, y hasta en el odio. Por esta razón, la moral no puede conceder ninguna autoridad ni ningún poder, porque como lo manifestó Sartre: “Un acto no es moral sino cuando es libre”.

    En la actualidad los debates sociales transcurren a través de los medios de comunicación en donde predomina la dictadura de la imagen, imagen que ha invadido nuestro espacio social y nuestras